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  • Hello everyone and welcome, in this video

  • I'm going to be explaining twin turbos now this isn't the place to learn how turbochargers work

  • So if you don't already know how turbochargers work, I'd recommend checking out my video explaining that. So twin turbos; In this video

  • I will be explaining two different setups,

  • one parallel and one sequential, both of which are going to utilize the same size turbo,

  • Just have two of them, but they're going to use them in different ways. Now,

  • there's another type out there which uses different size turbos which I will explain in a future video, so

  • The first and the most simple setup to basically understand is parallel and basically all you're doing is you're having two separate

  • turbochargers for two separate cylinder banks, so it's almost like you've got two separate turbocharged engines. So here we've got a V6

  • You can see the cylinder banks, and you've got your two intakes so here's your two turbochargers

  • Basically, during your exhaust stroke,

  • you're going to have exhaust come out through these exhaust manifolds

  • Spin up the turbos, the turbos are going to pull in air, the air will go through the intercooler through the throttle to the intake

  • manifold, to the cylinders and then repeat that process. So it's just like with a regular

  • turbocharger the only difference is you've got two cylinder banks, so you split up the work between two turbochargers.

  • So things to note on parallel is that both turbos are always going to be active for the entire RPM range

  • Well they may not, say you sized them so that they spool up at a higher RPM, that's fine, but point is they're both

  • always going to have exhaust flow directed towards them and both turbos are the same size as I mentioned.

  • Now another type of Turbo setup is sequential

  • So here we've got a four cylinder engine and basically what happens here is you have one turbo active at low RPM

  • and then both turbos active at a higher RPM when you have more exhaust flow.

  • So at low RPM you've only got a single turbo active and here

  • we have a bypass valve, and this is basically what shuts off this turbo, so if air isn't allowed to pass through here

  • It's not going to be able to spool up, and it's not going to be able to put any boost through this

  • Piping so basically what happens is after your exhaust stroke all your exhaust is going to be directed

  • to this turbo here, and so it's going to spool up this turbo, and then it's going to pull in air

  • through this intake along this channel, and so it'll send that air

  • Up here into the intercooler through your throttle into your intake manifold and then into your engine

  • And then It'll just keep recirculating like that along and then of course out the exhaust here

  • Now why would you only have one turbo spooling at low RPM?

  • Well the reason is you don't have that much exhaust so you couldn't

  • spool up both of these turbos with the limited amount of loss

  • Exhaust that you're making so you send all of it to one turbo

  • And that's enough to spool it up and create boost for the engine now at Higher RPM Scenarios

  • this bypass valve is going to open up

  • You're going to have a lot more exhaust and so all of that exhaust is going to be directed to both of these turbos

  • So they'll both be pulling in air, bringing it to the intercooler through the engine and then they'll continue spooling out both

  • of these turbos, and then finally out the exhaust so

  • Basically the reason you can do that is because you have more exhaust flow and once again both of these turbos are the same size

  • So if you have any questions, or comments feel free to leave them below and in my next video

  • I'll be explaining a twin-turbo setup in which you have different sized turbochargers

Hello everyone and welcome, in this video

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(How Twin Turbos Work - All The Boost!)

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    許小龍 發佈於 2021 年 01 月 14 日
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